Muffle-furnace.



E. GURRAN.

MUPFLE FURNACE.

APPLIOATION FILED MAB. 21, 1914.

1,114,587. Patented Oct. 20, 1914.

3 SHEETS-SHBET 1.

Zzye/z for' Edward @zal "r'a 7 L Mze-Skseks/ E.- GURRAN.

MUFPLE FURNAGE.

APPLICATION FILED mmm, 1914.

1,1 14,587. Paqented 0011.20, 1914.

3 SHEETS-SHEET 2.

THE MORRIS PETERS CO PHnTO-LITHO.. WASHINGTONv 1C 3 SHEETS-SHEET 3.

` Patented Oct. 20, 1914.

E. GURRAN.

MUPFLB FURNACB.

APPLICATION FILED MAILZI, 1914.

wy, Y;

Z 7: vez z for Edward fuffa,

ygovvzeyf EDWARD CURRAN, or CARDIFF, WALES.

MUFFLE-FURNACE.

Specification of Letters Patent. Pajgetd 20319145y Application filed March 21, 1914. Serial No. 826,342.

T all whom it may concern.'

Be it known that I, EDwARE CuimAN, a subject of the King of Great Britain, residing atCardifl, Vales, and whose post-office address is 72 Bute street, Cardi, "in thev county of Glamorgan, Wales, haveinvented certain new and useful Improvements in Munic-Furnaces, of which the following is a specification.

This invention relates to mufie furnaces and in particular to the arrangement of the heating'ues and the control of the gases traversingthem. According to thepresent invention these arrangements are such that the heating gases may be caused to traverse a flue or flues over the muffle (which may be constructed of solid or hollow brickwork) and pass thence direct to a flue or flues under the muffie througha downtale or downtales controlled by dampers operable from outside; or the gases may be vcaused to pass 4around the back and along the sides of the inutile and thence through downtakes controlled by dampers tok the fine or fines under the muflie and so to the chimney; or the heating gases may divide immediately after leaving the furnace or combustion space or after passing through a irebrick arch such as described in my United States Patent No. 1,015,616, dated January 23rd, 1912, part of the gases following the former, and the remainder the latter of the'two courses above indicated; or the heating gases may be caused to follow either of these ycourses but may be confined more or` less to either side of the furnace by having a symmetrical arrangement of fines on the two sides of the central longitudinal vertical plane of the muflie'. Further, the floor of the muifle may be built of the hollow bricks so as to providev passages in the m'uflle Hoor through which hot gases may pass from the fire arch or combustion space and thence into the main flue or fines under the furnace hoor, thesey `passages in the muflie floor being controlled by dampers `which mayy be fitted below the mouth of the muffle. v

lVitliin the transverse flue at the'bacl: of the muliie theremay be a wall extending more or less parallel with the rear wall of the inutile but separated therefrom so as to leave a space or cavity between them to prevent excessive heating of the rear end of the niuflcle.

In the accompanying drawings Figure 1 is a longitudinal section of a furnace emor luesfe under the furnace floor.

bodying the present invention; Fig. 2 a sectional plan of the saine; Fig. 3 a section on line 3 3 of Fig. 1; Fig. 4 a part section on line 4 4: of Fig. 1; Fig. 5 is a horizontaly section through the flues; Fig. 6 represents longitudinal sectionsof a portion of the fire arch taken on the line 5 5, Fig. 1, and looking respectively in opposite directions, and Fig. 7 is a longitudinal section on the line 7--7 of Fig. 2, that is, through a side fluey and the downtakes leading to a bottom flue.

damper cat each side near the end ofthe I furnace sitting away from the fire grate d or combustion chamber, each downtake lead- Aing to longitudinal iue ev extending under verse flue b atthe back of the niufl'le and approximately on the same levelv as the muflie iioor, leading to longitudinal 'flues i along each side of the muflie which in turn" communicate, through gdowntakes y' controlled by dampers 7c, with -thetwo longitudinal flues Ae, e under the inuiiie. The side flues i' are separated from the top iiue a each by a iiue roof wall d', Fig. 7. l

.The floor m of the inutile may be built 0f hollow vbricks so as to provide passagesa within the muffle floor through which the hot furnace gases maypass from the transverse` flue ft and, after-traversing the passages in the mums floor, 'pa-ss downward therefrom through downtahes o controlled by dainpers j) and thence into themain flue l/Vithin thetransverseflue '7i at the back of the inutile therel maybe a wall Z extending more or less parallel withtherear wall of the mufiie but separated therefrom so as to;4

leave a space or cavity between them to prevent excessive heating of the rear end of the muiiie.

As shown more particularly in Fig. 3 the arch or roof g of the muiiie is supported en-` ioo f renewed or repaired without disturbing the roof or the sides respectively. n

Above the grate d is a ire arch w, constructed as described inthe above-inen-` with doors u so as to enable the primary airV supply to the furnace to be cut olf altogether lexcept in so far as there may besoine leakage through the doors of the lire rake ports o.

lt is assumed that under these conditions the radiant energy from the fire arch w effects the continued distillation of the fuel on the grate el, combustion of the gaseous products taking place in the arch in the space above and below it. Under these conditions of working, y namely with the primary air supply cut ofi entirely by the ashpit doors a and only the secondary air being admittedto the various ducts in the re arch w `through secondary air ports one'of which is indicated at it is necessary to modify the chimney draft and consequently a main flue damper y is introduced in the chimney flue which is closed to the extent yof about or even more in order to maintain an ap-` proximation to the temperature which can be obtained in the furnace `when working with open ashpit andfull chimney draft; or the damper maybe closed altogether and yet tions of the controlling dampers may also be altered to suit particular conditions of working or constructions of furnace, the essential feature being that absolutely complete control of the heating gases can be obtained so that the niufllecanl be heated:l mainly along the top and either toward onej or both sidesof the same, or mainly along;

the side walls and either on one or both sides,

or mainly along the'floor and either on one or both sides of the same, or any combinationv of these conditions can be secured by the improved construction of furnace.

Having now particularly described and ascertained the nature of my said invention and the best means I know of carrying the same into practical effect, l claim:-

l. A niuflle furnace having top, side and bottom flues for heating the furnace, downtalies connecting the top and bottom lues, separate downtakes connecting the side and bottom fines, and controlling dampers insaid downtakes whereby the heating gases can be simultaneously distributed through alllthe ilues and alternatively can be confined to the top andbottoni iues or to the side and bottom flues only.

2. A muiiie furnace having a combustion space, a top flue for conducting gases from the combustion space above the muile roof, separate side fines for conducting gases from the combustion space along the side walls of the mufile, a flue formed in the floor of the niuiile, longitudinal flues to receive gases f'romthe fines before mentioned and conduct such gases beneath the niufile and thence to a chimney., and controlling dampers in each of the topside and floor fiues whereby the gases can be simultaneously distributed through them or conned to either one or more of them.

3. A muflle furnace having a'combustion chamber in rear of its rear wall, heating flues leading from said chamber and arranged on the top and sides and below the bottom of the muffle, a transverse partition wall between the said chamber and the rear wall of the mulile, a second transverse wall extendingv between the side flues and disposed between the said partition wall and the rear muiile wall, said second transverse wall being substantially parallel with the rear muflie wall and forming an air space with it.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

y EDWARD CURRAN. llVitnesses:

JOSEPH MILLARD,

W'ALTER I. SKERTEN.

Copies of this patent may be obtained for five cents each, by addressing' the Commissioner of Patents,

- f K Washington, D. CJ 

